Discussion
Why is measuring the emitter voltage often more informative than the base voltage?
Answer: C
The emitter voltage divided by the emitter resistor gives the current at once, and the current is what the design actually specifies. Meter loading is a genuine but secondary consideration, stiffness needs two measurements to assess, and beta needs the base current as well. Measuring at the point where a single reading converts straight into the quantity of interest is worth a moment's thought before probing anything. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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